Improvement in scroll-saws



waited states @tutti chillin,

Letters Patent No. 101,897 (latcll April 12, 1870.

IMPROVEMENT IN scRoLL-sAWs.

Mrk-

The Schedule referred to in these Letters Patent and making part of the same To all 'whom it may concern.-

Be it known that I, REUBEN MoCuEsxuv, of Birmingham, in the county of New Haven and State of t Connecticut, have invented certain new and useful "through the'upper saw-head and its air-pump, in a vertical plane.

Figure 4, plate 1, is a section, taken through the upper saw -head and its guides, in the horizontal plane indicated by dotted lines y y in figs. 2 and 3.

`Figure 5, plate 1, is an enlarged diametrioal section through one of the saw-belt pulleys, showingr the manner of lubricating the same. v

Figure 6, plate 2, is a section, taken transversely through the sawing-machine, in the vertical plane indicated by dotted line a: x in fig. 1.

Figure 7,`plate 2, is a top view of the table-frame and its attachments.

Figure 8, plate 2, is a view of .the upper adjustable saw-belt pulley and its adjusting lever.

Figure t), plate 2, shows the improved saw.

Similar letters of' reference. indicate Vcorresponding parts in the several figures.

This invention relates to certain novel improvements on scrolll or gig-sawing machinery, and consist-sv First, in a horizontally and vertically adjustable ruide for the u )or rece n'ocatino' saw-head whereb pl l. o 1 y the guide can be adjusted in a true vertical position with respect `to the lower saw-guide, and also adjusted vertically for adapting the machine to receive saws of different lengths, and to work stui of different thicknesses, as will behereinafter explained.

Second, in applying one of the pulleys, over which passes the belt or iiexible saw connection, to an adjustable bearing, which will allow a saw to be quickly slackened when it is desired to remove it from its heads or holders, as will be hereinafter explained.

Third, in applying above the upper saw-carrying head an elastic cushion, which is so arranged that should a saw break while the machine is in operation, this cushion will receive the blow caused by the sudden ascent of the upper saw-head, and thereby prevent this head from striking the upper pulley of the flexible saw connection, as will. be hereinafter explained.V

Fourth, in applying to the slotted foot-piece of' the upper saw-head an adjusting-screw, in such manner that when a saw is in its place between the upper and lower heads, this `screw will afford a back bearing for the upper end of' the saw, and admit -of readily adjusting the saw to any required rake or degree of pitch, as will be hereinafter explained.

Fifth, in a novel air-pump, having a gravitating piston, and applied to the upper saw-head for the purpose of blowing currentsv of air upon the work, and enabling the sawyer to see his lines, and guide the work accordingly.

Sixth, in constructing the frame of the table, upon which the work 'lies while being guided to the saw, of vertical sections, united by tubular braces and through-tie rods, whereby a very substantial frame is obtained, which can be taken to pieces and packed in a very small compass for transportation, as will he hereinafter explained.

To enable others skilled in the art to understand my invention, I will describe its construction and operation. 4

. In the accompanying drawings- A A A represent three vertical sections, which are secured togetherat suitable-distances apart, and conlstitnte a frame for supportingr the horizontal table top A, upon which the work lies while being sawed.

For the purpose of rigidly securing the sections A together I employ tubes a', having tenons formed on` their ends, which tenons are fitted in recesses made into the said sections; and for the purpose of' drawing together and holding the sections against outward thrust, bolts a are passed horizontally through the sections and the tubes, as shown in fig. 6, and secured by means of nuts on their extremities.

A frame constructed and put together in thisway will be very rigid and substantial, and when necessary to pack it for transport-ation, it can be conveniently taken down and stowed away in a very'small space.

The vertical sections A will be made of met-al or wood, the former being preferable.

From the middle of the length ofl the intermediate frame scc-tion A, and depending from the top hori zontal portion of' this section, is a piece, C', to which is rigidly secured a guide-block, C, having vertical jaws tl l upon its front face, between which the lower saw-head g is fitted to slide up and down.

r1`he head g, which is constructed with a forked holder, lr', for the lower end of the saw c, receives vertical motion from a wheel, q, ou shaft Q, through the medium of' a pitma'n, P, which may be provided with a turnbuckle, for extending or contracting it.

made adjustable toward or from the axis of this wheel,

Vfor shortening or lengthening the stroke of the saw.

Motion may be transmitted to shaft Q by means of a belt, or in any other convenient manner.

From the joists or ceiling of the buildingA of the apartment in which the machine is arranged, and directly over the table top A,'depends a braced support, F', which is rigidly secured to the joistsin proper position with respect to the lower guide-block C', to afford a support and means of attachment for the upper guide E, as" shown in iigs. 1 and 6.

To the central veitical portion of the braced pendant F', aver-tical guide, D, is secured, by means of bolts e c, which pass throu'gh oblong slots made through the guide D, and receive binding nuts upon them, back of the pendant, as shown in iig. 6.

Byloosening the nuts on bolts c c, the guide D can be adjusted vertically.

The guide D has feathers on its vertical edges which receive jaws whichv are formed on the guideblock E, which latter is secured to the guide D, by means of set-screws t, (see g. 4,) and adjusting setscrews p 1J.

The en'ds of screws pp abut against the feathers on the guide D, and are used for adjusting the guideblock E laterally, for setting and keeping it in a true vertical position.

The screws t are used for allowing the guide-block E to be adjusted vertically on the guide D, for accommodating this block to different thicknesses of stuft' it is desired to saw.

The guide-block is provided with two jaws, h h', one of which is fixed permanently, and the othelgvh', is adjustable, to compensate for wear.

Between these jaws h h, the upper saw-jaw head 1/ is litted to move up and down, and when this head works loose, as it will do when the machine isy used for a considerable length of time, the screws n?, (see iig. 4,) are turned so as to set the jaw h up snugly against the head. -v

Two ends of the heads g g are connected together by the saw c, and the two opposite ends of these heads are connected by a strap, c', which may be of metal, leather, or other suitable material.

This exible connection is fastened by its upper end to a loop, rising centrally from the upper end of the saw-head g-, and carried upward, and passed over a grooved pulley, b2, thence oli to one side of the machine, and around a grooved pulley, b, thence downward beneath a grooved pulley, b, and upward to a loop on the bottom of the lower saw-head g, to which loop the strap is attached, as shown in fig. l.

Thus it will be seen that the saw c and flexible connection c', with the heads g g', form a continuous or endless belt, which will receive a reciprocating motion from the wheel q, through the ptman P, acting on the lower saw-head g.

The lower pulley b1 has its axis or 4stud fixed to a pendant, which is rigidly secured to the lower end of the guide-block C.

The pulley I) has its bearings upon the outer extended arm of a .horizontally-adjustable beam, B, and the pulley b2 has its bearings on the short arm of av hand-lever, j, which lever is pivoted to a bracket, i", secured to the upper portion of the guide-block E.

The beam B has tenons formed on its parallel edges, which are fitted to slide in grooves formed-in the upper horizontal port-ions of two of the frame sections A A, and this beam is out awa-y, as shown in g. 7, so as not to interfere with the'lower sawguide and the saw.

By means of a screw, B, which vis tapped through a tixe'd block, B2, the beam B can be adjusted in a direction with its length, andthe flexible connection cand saw c tightened or loosened as may be required.

By this means the vsaw can be tightened while running. A

The lever j, carrying pulley b2, has an indentation made into its longest arm, which is received by a fixed conical stud, r, on bracket r', when the leverj is in the vertical position, shown in full lines, figs. l and S, and thus held firmly.

By springiig the leverj outward, so as to free it from its stud T, and swinging' this. lever to one side, as indicated in iig. S, in dotted lines, theistrap c will Vbe slackened, and the saw c can be removed from its other material, is afigred to the guide-block E, in

such position as to receive the blow of the saw-head shouldan accident occur to the same.

Hitherto gig-saws' have been secured to their restuds therein, which studs allowed the saws to be strained between forked holders.

The clamping devices are liableto many objections, and the applying of studs through holes' made through the ends of the saw-blades, weakensthe saws at those points, and 'renders them very liable to break.

To obviate these objections, I solder or braze on each side of eachend ofthe saw c a piece, s, of metal of suitable thickness, and of 'a width' equal, or nearly so, to the width of the saw-blade, as shown in lig. 9.

ln this way I form enlargements on the ends of a saw for allowing it to be strained between the forks It' 7a', and I strengthen the saw s'o that it will not be liable to break at those points.

. As an equivalent of this plan of enlarging the ends of .a saw-blade, the ends of a blade may be heated and bent around a pin, so as to form rounded enlargements.

I shall now refer particularly to figs. 2, 3, and 4.

To the face of the upper saw-head g I secure, by means of straps ff, or in any other suitable manner, a cylinder, F, which is open at its upper end, andclosed at its lower end, except a small orilce into which a tube, f1, is fixed, as shown in iig. 2.

Within the cylinder F a ball or cylindrical plug, f2,

'is put, so as to play freely up and down, which ball or plug may have a valve opening downward adapted to it.

The cylinder F is, the body of a pump, and the ball or plug f2 the piston thereof, and when the saw is ruiming, thc rapid vertical motions given to head g will cause the piston j"2 to play up and down, and force currents of air through tube j" upon the work for blowing away the saw-dust.

I prefer to make the body F cylindrical, but it may be made prismatic.

In the back of the saw-head g a chamber, m, is formed, which is filled with cotton-waste, or other suitable porous substance, saturated with oil, and closed by a sliding cover, m, tted in a dovetail groove made into. the back ot' the saw-head, as shown in figs. 3and 4.

A sufiicientv quantity of oil will escape from the chamber m to keep the saw-headwell lubricated.

In fig. 3 I havejshown an adjusting-screw, l, ap'

plied to the forked holder k, and tapped into the latter from behind, so as to afford a back-rest for the saw near its upper end.

This screw `being adjustable, serves as a very convenient means for giving the desired forward rake or pitch to the saw.

In fig. 5, l have shown an enlarged section of one of the pulleys, over which the flexible saW-connec' tion c passes, and the short shaft b* of this pulley.

It will be seen that the shaft?)4 is hollow, and that by supplying Athe chamber 2 with oil, through the inlent 1, the oil will escape through outlet- 3, and lubricate the parts.

The conical Washer b5 being tightly screwed into its seat in oneend of shaft b4, will prevent the escape of the oil from the chamber 2;

In referring to the tubular braces a', I described them as having tenons formed on their ends, which entered mortises made into the frame A. Instead of the tenons, dowel-.pins may be formed on the ends of said braces a', and perforated metal plates inserted into the frame A, for receiving said dowel-pins.

Having described my invention,

What I claim as new, and desire to secure by Letters Patent, is-

l. The horizontal and vertical guide E, applied to a vertically-adjustable guide, D, substantially in the manner and for the purposes deseribed.

2.- 'lhe pulley b2, of the saw-connection c', applied to an adjustable bearing, j, or its equivalent, substantially as and for the purposes described.

3. The cushion i, arranged above the saw-carrying head g', substantially as and for the purposes described..

'4. lhe device l, for adjusting the saw for diiierent rakes, applied to holder le, so as to serve as a backbearing, substantially as described.

5. An air-pump, which is constructed and applied to a sawing-machine, substantially as described.

6. The saw-frame A, made of rigid sections, conand by tie-rods passed through said tubes, substantially as described.

Witnesses: REUBEN MCoHEsNEY.

.HENRY ATWATER, l

(IE. CLARK.

nected together by tubes a', ,tenoned into the frame, 

